8421816 has 32 divisors (see below), whose sum is σ = 22674960. Its totient is φ = 2591232.

The previous prime is 8421799. The next prime is 8421821. The reversal of 8421816 is 6181248.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13185 + ... + 13808.

Almost surely, 2^8421816 is an apocalyptic number.

It is an amenable number.

8421816 is an abundant number, since it is smaller than the sum of its proper divisors (14253144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8421816 is a wasteful number, since it uses less digits than its factorization.

8421816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27015 (or 27011 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 8421816 is about 2902.0365263036. The cubic root of 8421816 is about 203.4551010017.

The spelling of 8421816 in words is "eight million, four hundred twenty-one thousand, eight hundred sixteen".